There is already a thread on the subject which is marked as solved but unfortunately the solution does not apply to my circumstances.
Ghost 15 has been running fine on my machine for a long time but suddenly it has stopped working with the " Will not connect to agent" error message.
I have not install any new applications and I don't have N360. I can see the backups on the backup drive which is working normally. Everything else on the machine and the network is working normally
I have to confess I don't know what "The agent" is and it doesn't seem to be defined in the help files.